I added a cloak of shadows and meditation amulet, doubled up on death ring since people like to dissolve it so much, and reduced down to one zombie frenzy, and have been kicking butt with this build now. Out of my last 5 games I've won 4 and most of them pretty easily. Using the sacrificial altar to buff Shaggie, and then obliterating something else to buff him again makes him pretty nasty. My teleports, force pulls, and force holds mages/creatures in place and make it hard too hard to run away from Shaggie and the rest of the swarm. I played a Warlock and knocked out Adramalech in two turns thanks to a Maim wings, and Shaggie hitting for 9 dice a turn. I'm sure there's some more fine tuning, but right now it's really working well for me.
Thanks for all the suggestions.